Starting from the definition of traditional thermal power generation enterprises, this paper defines thermal power enterprises that are committed to achieving the carbon peak and neutrality by developing new energy sources as new type thermal power enterprises. Considering that China’s current environmental management and environmental performance evaluation mainly focus on the treatment of pollutants in terms of prevention and control, an indicator system that comprehensively considers the whole process of environmental management of power generation enterprises has been constructed, and the factors affecting the environmental performance of enterprises have been effectively identified. The factor analysis method comprehensively evaluates the environmental performance of China’s new type thermal power enterprises, realizes the comparability of environmental performance among power generation enterprises, and enables stakeholders such as the government and the public to conduct supervision in a timely, accurate, and comprehensive manner. In addition, it is the first time to combine the environmental performance evaluation with the carbon peak and neutrality and introduce the carbon reduction capability evaluation indicator into the indicator system, which enriches the practical significance of the environmental performance of power generation enterprises.